A free program for Android, by VOZGA.

River Crossing IQ – Best IQ Test is a fun and challenging logic game where you must figure out how to move a family of five across a river by using a boat. The boat is capable of carrying no more than two people at a time. You will need to use your logic to make the right decisions and use the right methods to get the job done. You will need to be quick on your feet and make sure that you don’t miss any opportunities. There is a time limit for each level, so you will need to make sure that you don’t take too much time.

The game is designed to improve your brain and logic skills.